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Abstract:

A method for communicating between a user using a viewing device (2000)
and the viewing device, includes the following steps: acquiring, at an
acquisition interface (1400) integrated into a pair of glasses (1000) of
the user, an item of information on utilization of the glasses; and
generating and sending to the viewing device (2000), by a microcontroller
(1100) integrated into the glasses, a data signal (DATA) depending on the
acquired information. The acquired information enables in particular the
authentication of the user, so as to send, to the viewing device, data
that the latter will use to display a digital content.

Claims:

1. A method for communicating between a user using a viewing device
(2000) and said viewing device, comprising the following steps:
acquiring, at an acquisition interface (1400) integrated into a pair of
glasses (1000) of the user, an item of information on utilization of the
glasses, generating and sending to the viewing device (2000), by a
microcontroller (1100) integrated into the glasses, a data signal (DATA)
depending on the acquired information.

2. A method according to claim 1, wherein the acquired information on
utilization of the glasses is information for authentication of the user.

3. A method according to claim 2, wherein the acquired authentication
information is an item of biometric information acquired with the use of
at least one sensor integrated into the glasses.

4. A method according to claim 2, further comprising the authentication
of the user at the microcontroller (1100) integrated into the glasses and
on the basis of the acquired authentication information, before sending
said data signal (DATA) to the viewing device (2000) only in case of
successful authentication.

5. A method according to claim 1, wherein the data signal (DATA)
generated and sent comprises at least one cryptographic key for
deciphering a digital content to display on the viewing device (2000).

6. A method according to claim 1, further comprising, at the
microcontroller (1100) of the glasses, the following steps: obtaining an
encrypted digital content; obtaining a decryption key from the acquired
information; decrypting the encrypted digital content using the
decryption key; and in which method the data signal (DATA) sent to the
viewing device (2000) comprises the digital content so decrypted.

7. A method according to claim 6, wherein obtaining the encrypted digital
content comprises reception, by a communication interface (1200)
integrated into the glasses, of an encrypted digital content sent by the
viewing device (2000).

8. A method according to claim 7, wherein the continuous decryption of
the encrypted digital content using the decryption key and the continuous
sending of the decrypted content to the viewing device (2000) are
dependent upon continuous detection, by at least one sensor (1400)
integrated into the glasses (1000), of the wearing of the glasses by said
user.

9. A method according to claim 1, wherein the data signal generated and
sent (DATA) comprises configuration data to configure the viewing device
(2000).

10. A method according to claim 9, wherein the configuration data belong
to a profile specific to the user and obtained using said acquired
information.

11. A method according to claim 1, wherein the data signal generated and
sent (DATA) comprises data to display by said viewing device (2000).

12. A method according to claim 1, wherein the data signal generated and
sent (DATA) comprises a command signal of the viewing device (2000).

13. A method according to claim 1, wherein the viewing device (2000)
comprises a 3D display screen (2400) and the glasses (1000) are 3D
glasses for viewing a 3D image on said screen.

14. A method according to claim 1, wherein the viewing device (2000) and
the glasses (1000) are distinct items of equipment.

15. Glasses (1000) for a user using a viewing device (2000), integrating:
an acquisition interface (1400) configured to acquire an item of
information on utilization of the glasses. a microcontroller (1100) to
generate and control the sending, to the viewing device (2000), of a data
signal (DATA) according to the acquired information.

16. A method according to claim 3, further comprising the authentication
of the user at the microcontroller (1100) integrated into the glasses and
on the basis of the acquired authentication information, before sending
said data signal (DATA) to the viewing device (2000) only in case of
successful authentication.

Description:

[0001] The present invention concerns a method of communication and an
associated system of glasses type for a user using a viewing station. The
invention has a particular application in the communication between 3D
glasses and a corresponding 3D display screen.

[0002] Those having glasses often use them to look at a viewing station,
such as a television or a cinema screen. These glasses may be corrective
glasses to correct defects in the user's eyes. They may also be specific
to the viewing station used, giving additional functions. Such is the
case for the recent 3D glasses which give a 3D relief effect in
conjunction with an associated 3D screen.

[0003] Active 3D glasses exist today, for example in accordance with the
XPanD 3D (trade name) technology, whereby the 3D effect is obtained by
rapid and successive obturations of each eye, synchronized with the 3D
images displayed on a 3D television or 3D cinema screen. That
synchronization is provided using an infrared synchronization signal sent
to the glasses by the source of the images displayed, as described for
example in the publication US 2010/194857.

[0004] Generally speaking, the use of glasses is closely linked to the
visual nature of the viewing stations. It is thus desirable to take
advantage of this situation to improve the use of viewing stations, such
as a television.

[0005] To that end, the present invention concerns in particular a method
for communicating between a user using a viewing device and said viewing
device, comprising the following steps:

[0006] acquiring, at an
acquisition interface integrated into a pair of glasses of the user, an
item of information on utilization of the glasses,

[0007] generating and
sending to the viewing device, by a microcontroller integrated into the
glasses, a data signal depending on the acquired information.

[0008] The invention makes it possible to take advantage of the glasses
used in the context of a viewing action, as a data source favorable to
the operation of the viewing device. This is made possible, according to
the invention, by the acquiring of an item of information at an
acquisition interface enabling evaluation of an external utilization
environment and by the sending of a signal which derives therefrom to
said viewing device.

[0009] To be precise, glasses constitute a device that is fully
complementary to a viewing device, and on that basis, may be used
effectively for providing data to said viewing device.

[0010] As described below, the acquisition interface enables detection of
an item of information relative to an external environment, such as the
fact of using the glasses that is detected by an appropriate sensor or
such as the identity of the user for the purposes of sending data which
may be personalized. The sending may be performed by conventional
communication techniques, and advantageously by wireless communication of
radio type (in accordance with the standard Zigbee or Bluetooth--trade
names) or infrared.

[0011] The current miniaturization techniques, for example via secure
modules or chip cards, enabling solutions to be provided for integrating
components, such as an acquisition interface, a microcontroller and/or a
communication interface, within a glasses structure (for example in the
arms and/or the frame of the glasses).

[0012] In an embodiment of the invention, the acquired information on
utilization of the glasses is information for authentication of the user.
Various embodiments are provided as described below, ranging from the
acquiring of biometric data to the input of a confidential code (for
example a PIN code, PIN standing for Personal Identification Number).
This configuration enables personalized operations to be carried out and
thus to send to the viewing device, by the user's glasses, data that are
also personalized.

[0013] In particular, the acquired authentication information is an item
of biometric information acquired with the use of at least one sensor
integrated into the glasses. On account of their position on the user
and/or their manipulation, glasses constitute an effective means for
acquiring biometric data from the user without seeking the user's
involvement: detection of a finger print during manipulation of the arms,
detection of an angle of inclination of the head specific to the user or
biometric data representing characteristics of the user's head (iris,
retina, image of the face, size and shape of the head deduced from the
deformation of the arms, etc.) during use of the glasses.

[0014] In an embodiment, the method further comprises the authentication
of the user at the microcontroller integrated into the glasses and on the
basis of the acquired authentication information, before sending said
data signal to the viewing device only in case of successful
authentication. Thus, the sending of data (for example a second item of
information stored in memory) to the viewing device is dependent upon the
authentication of the glasses wearer.

[0015] According to variant embodiments, the data signal generated and
sent is of varied nature. In particular, the viewing device
advantageously takes into account the data of the signal generated and
sent to render a content on a display screen.

[0016] Thus, according to a first embodiment, the data signal generated
and sent comprises at least one cryptographic key for deciphering a
digital content to display on the viewing device.

[0017] This provision enables the user to use his glasses to store a
deciphering key which is generally specific to him. This information is
for example stored in memory of a secure module.

[0018] In a configuration as a variant, it may be provided for the method
to comprise, situated at the microcontroller of the glasses, the
following steps:

[0019] obtaining an encrypted digital content;

[0020]
obtaining a decryption key from the acquired information;

[0021]
decrypting the encrypted digital content using the decryption key;

[0022] and in which method the data signal sent to the viewing device
comprises the digital content so decrypted.

[0023] The glasses are thus provided as means for decrypting the data to
view, which may be stored locally in a memory integrated into the glasses
or be received from an external device. In particular, obtaining the
encrypted digital content may comprise reception, by a communication
interface integrated into the glasses, of an encrypted digital content
sent by the viewing device.

[0024] The glasses may thus constitute a personal decryption means which
the user can carry and use in any location.

[0025] The use of the glasses for such decryption may furthermore be
dependent upon the actual use of the glasses by the user. In this
context, the continuous decryption of the encrypted digital content using
the decryption key and the continuous sending of the decrypted content to
the viewing device are dependent upon continuous detection, by at least
one sensor integrated into the glasses, of the wearing of the glasses by
said user. In other words, if the wearing of the glasses is interrupted,
the decryption and the sending are also interrupted. This provision makes
the use of the glasses secure when they comprise a decryption key, which
is generally personal.

[0026] The continuous detection may in particular comprise the continuous
authentication (by analysis of the iris, the retina, the image of the
face, etc) of the user to whom the decryption key used is personal

[0027] According to another embodiment, the data signal generated and sent
comprises configuration data to configure (for example an audio and/or
display rendering) the viewing device. It comprises personal preferences
(volume, preferred channels or languages, default parameters, etc.). To
be precise, as the glasses are personal objects, they may be used
advantageously for personalization purposes. In particular, the
configuration data belong to a profile specific to the user and obtained
using said acquired information (generally an item of identification
data, whether or not biometric).

[0028] According to still another embodiment, the data signal generated
and sent comprises data to display by said viewing device. By way of
example, this may be menus, for example personalized according to the
user or specific to the functions linked to the presence of glasses
(enlargement, 3D function for 3D glasses).

[0029] According to still another embodiment, the data signal generated
and sent comprises a command signal of the viewing device. In this
configuration, the glasses may be used as a remote controller of said
viewing device, for example by detection of the movements of the head or
eyes of the user.

[0030] According to a particular application of the invention, the viewing
device comprises a 3D display screen and the glasses are 3D glasses for
viewing a 3D image on said screen. As a matter of fact, in that case, the
presence of the glasses is generally indispensable to fully take
advantage of the possibilities of the display screen.

[0031] Thus, it is desirable to take advantage of that presence to use the
glasses as a data source for that screen.

[0032] In a complementary manner, the invention also concerns glasses for
a user using a viewing device, integrating:

[0033] an acquisition
interface configured to acquire an item of information on utilization of
the glasses.

[0034] a microcontroller to generate and control the
sending, to the viewing device, of a data signal according to the
acquired information.

[0035] The glasses have similar advantages to those of the communication
method set out above.

[0036] Optionally, the glasses may comprise means relating to the features
of the communication method set out above.

[0037] Still other particularities and advantages of the invention will
appear in the following description, illustrated by the accompanying
drawings, in which:

[0038] FIG. 1 is a diagram of the glasses and a viewing device according
to the invention;

[0039] FIG. 2 illustrates an example of a biometric information sensor for
an implementation of the invention; and

[0040]FIG. 3 illustrates another example of a user sensor of the glasses
according to the invention.

[0041] FIG. 1 is a diagram of glasses 1000 of a user and of a viewing
device 2000, for example a television, a computer or a tablet computer.

[0042] The glasses 1000 may be conventional spectacles which the user
wears when looking at a content on the viewing device 2000. When the
latter is designed to display contents in three dimensions (3D), the
glasses 1000 may be of the 3D glasses type well-known to the person
skilled in the art.

[0043] The drawing shows electronic components integrated into the glasses
1000, for example according to the same mechanisms of integration as
those utilized for the production of so-called active 3D glasses. These
electronic components are in particular integrated into the frame of the
glasses 1000, for example at the location of the arms, of the frame rims
surrounding the lenses or of the bridge linking those rims. As a variant,
they are added to a printed circuit of small size (for example a chip
card) physically linked to the glasses.

[0044] In an embodiment, all or some of these components are integrated
into a secure microcircuit module (or chip card in accordance with the
ISO7816 standard).

[0045] The glasses 1000 thus integrate a microcontroller 1100, a
communication module 1200 with the viewing device 2000, a memory 1300, as
well as an acquisition interface 1400 designed to acquire an item of
information on utilization of the glasses.

[0046] The microcontroller 1100 is advantageously rendered secure, that is
to say in conformity with the common criterion or with the FIPS standard
(FIPS standing for Federal Information Processing Standards).

[0047] The nature of the communication module 1200 may be divers as will
be apparent from the examples of application of the invention below. For
example, the communication module 1200 is a transmitter-receiver of
radiofrequency type in particular according to one of the protocols
Zigbee, Bluetooth, IEEE standard 802.15.1, or of infrared type.

[0048] The communication module 1200 enables the sending of a data signal
generated at the glasses in accordance with the invention. In certain
applications, this module 1200 also enables the reception of data from an
external source, including the viewing device 2000, in which case
bi-directional communication with the device 2000 is implemented.

[0049] In an embodiment, this communication module 1200 implements
communications that are rendered secure using cryptographic means, for
example by signature or encryption/decryption. In this case,
encryption/decryption algorithms and corresponding keys are provided in
the microcontrollers integrated in the glasses and present in the
external equipment (in particular the viewing device 2000).

[0050] The memory 1300 is a storage memory, of read only memory or flash
memory type. According to the invention, it preferably comprises at least
one item of information from which the data signal to send to the viewing
device 2000 is generated. As illustrated in the examples below, the
nature of this information may be diverse: cryptographic key, digital
content, system or user preferences, etc.

[0051] The acquisition interface 1400 is an input-output interface
preferably constituted by at least one sensor enabling the acquisition of
an item of information on utilization of the glasses. It may, in
particular be a man-machine interface by which the user specifies an item
of identification or authentication data (a PIN code input on a keyboard,
an item of biometric data acquired by appropriate sensors, for example).
Various examples of applications are described below.

[0052] According to the invention, such information acquired by the
interface 1400 is used to generate, by the microcontroller 1100, a data
signal DATA intended for the viewing device 2000, television or tablet
computer, for example.

[0053] In a particular embodiment, the interface 1400 may furthermore
comprise a button and/or a keyboard enabling the user to confirm or
inhibit the sending of the data signal DATA to the device 2000.

[0054] The viewing device 2000 comprises, in addition to a microcontroller
2100, a communication module 2200 corresponding to that 1200 of the
glasses 1000, to receive that data signal DATA. This communication module
2200 thus enables communication with several glasses of several users,
and possibly with other external devices.

[0055] Lastly, on account of its visual nature, the viewing device 2000
also comprises a screen 2400 to display a digital content. The digital
content or its rendering may in particular depend on the data signal DATA
received as will become apparent in more detail from examples below.

[0056] In a first general example of the invention implementing an
authentication of the user of the glasses 1000, the latter inputs
authentication (or "identification") data AU using the acquisition
interface 1400. These data AU are sent to the microcontroller 1100 which
compares them to reference authentication data RA stored in the memory
1300.

[0057] This comparison constitutes an operation of authentication of the
user. If the data AU and RA match (successful authentication), the
microcontroller 1100 retrieves data DATA stored in the memory 1300 and
sends them to the viewing device 2000 via the radio communication module
1200.

[0058] On reception of those data DATA, the viewing device 2000 commands
the display and the rendering of a digital content on the display 2400
according to those data DATA.

[0059] For the acquisition of the authentication data AU, the acquisition
interface 1400 may be constituted by biometric or similar sensors, or by
an input interface such as a miniature digital or alphanumeric keyboard,
or by a contact free communication interface.

[0060] Using a miniature keyboard, the user may thus input a PIN code as
authentication data. The authentication then consists in comparing that
PIN code with a pre-recorded reference PIN code.

[0061] As regards the contact free communication interface, typically in
accordance with the ISO/IEC 14443 standard or according to the NFC
protocol (NFC standing for Near Field Communication), equipping a chip
card integrated into the glasses 1000, the user of the glasses may be the
wearer (in a pocket) of an external chip card reader according to that
standard enabling the sending of an item of authentication information AU
from the reader to the interface 1400 (it being possible for that
information AU to be stored in memory of the reader or to be input by the
user on the external reader). The user thus performs contact free
self-authentication.

[0062] Lastly, using a biometric sensor, the user may input an item of
biometric authentication information such as for example a finger print
(set of minutiae representing said finger print).

[0063] Preferably, the biometric sensor may be disposed such that no
deliberate action of the user is required. For example, the finger print
sensor may be provided on the arms of the glasses such that by
manipulating them (while opening them, for example), a finger print of
the user is acquired.

[0064] Another example of biometric information may be the angle of
inclination of the glasses relative to the horizontal. As a matter of
fact, this angle is characteristic of the user without any specific
action by the user. The appropriate sensor 1400 is in this case an
inclinometer, for example of MEMS form (MEMS standing for
Microelectromechanical systems).

[0065] The biometric information may as a variant represent at least one
characteristic of the user's head. This information may then be acquired
by the sensor or sensors 1400 during wearing of the glasses.

[0066] In a first example, the biometric information represents dimensions
of the head at the location of the glasses. Sensors 1400 of stress or
deformation gauge type may be provided in the arms of the glasses (one
sensor per arm, or a plurality of sensors distributed along each arm for
greater precision in the evaluation of the deformation) so as to obtain a
value representing the spread of the arms and thus the dimensions of the
head at the location of the glasses worn.

[0067] In another example, the biometric information is an image of the
face to compare with a pre-recorded image RA. In particular, that image
may be a view from above of the face acquired by a camera 1400 situated
for example on the bridge of the glasses 1000, as illustrated
diagrammatically in FIG. 2.

[0068] In a variant also using a camera 1400, this time situated on the
edge of the frame rims, the biometric information may be an image of the
iris of the user acquired by that camera when the user gazes towards it,
for example on being instructed by a message displayed on the screen 2400
of the viewing device 2000.

[0069] The acquisition of an item of biometric information (for example
the iris, the face, a dimension of the head, etc.) of the user without
deliberate aid by the user has the advantage of being able to implement,
within the microcontroller 1100, a continuous verification or "continuous
authentication" of the wearer of the glasses. The sending of data may for
example be dependent over time on this continuous authentication, the
sending of data also varying over time: as soon as the authentication is
no longer obtained (the user removes the glasses for example), the
sending of the data in course is interrupted, until the user once again
wears the glasses. This configuration notably increases the security in
the sending of highly personalized data.

[0070] As referred to previously, the very nature of the data DATA
according to the invention may vary appreciably according to different
applications.

[0071] According to one configuration, those data, initially stored in the
memory 1300, are extracted therefrom in case of positive authentication,
and then sent to the viewing device 2000. When those data are
personalized, the invention enables the user to carry them with him (for
example configuration parameters as described below) and to use any
viewing device with those personalized data.

[0072] According to one application, those data are elements of an
interactive menu. Thus, when the user wears glasses, they send those
elements of interactive menu, after authentication, to the device 2000,
it thus being possible for them to be personalized according to the user.
Next an interactive menu with all or some of those elements is displayed
to the user on the screen 2400, which user browses in the menu in a
conventional manner using a remote controller of the device 2000.

[0073] In rather similar manner, those data may be data complementary to a
program in course of display on the screen 2400. By way of illustration,
this may be a translation of the audio track in the language of the user
of the glasses, or explanations or comments (in text or audio form) of
the program displayed.

[0074] According to another application, those data sent after
authentication are configuration or preferences information, which may be
personal to the user, for example the volume of sound to apply by the
device 2000, a channel to start on turning on the device 2000, rendering
parameters such as the luminosity or the contrast or the display format
(16/9, 4/3; 2D or 3D image, etc.). In the presence of the glasses and
possibly in case of successful authentication, the viewing device 2000
then operates according to that configuration information.

[0075] According to still another application, those data may comprise an
item of information to authorize or not to authorize the reproduction and
rendering of a digital content by the device 2000. For example, this may
be a cryptographic key provided to decrypt an encrypted digital stream by
a tuner of the device 2000. Thus, in the presence of the glasses and a
successful authentication, the cryptographic key is sent to the device
2000 which may then decrypt the digital stream and display its content
(in other words, this makes it possible in particular to decode encrypted
channels in secure manner). The authentication beforehand of the user
thus ensures a secure use of the cryptographic key to decode the digital
stream.

[0076] According to still another application, those data initially stored
in the memory 1300 may be a digital content to display on the screen
2400, for example photographs or a video sequence. Preferably, in this
case, a memory card will be used, for example of microSD type (SD
standing for Secure Digital). Thus, the device 2000 receives, directly
from the glasses, a digital content to display.

[0077] According to still another application, the glasses may be used as
a remote controller for the viewing device 2000. In this case, the data
initially stored in the memory 1300 are command signals compatible with
the device 2000.

[0078] By way of illustration, the sensor 1400 may be of motion sensor
type (accelerometer or inclinometer in particular) enabling a movement or
a position of the user's head to be detected. On detection of such a
movement, an associated command signal is sent to the device 2000 in
order, for example, to modify its display.

[0079] For example, if the sensor 1400 detects that a user is lying down,
the image displayed by 2400 may be turned through 90°.

[0080] According to another example, if the sensor 1400 detects a "no"
movement of the head, a signal commanding the device 2000 to be turned
off may be sent.

[0081] It is to be noted that if several users of the same device 2000
each wear glasses according to the invention, on reception of such a
command signal the device 2000 may display a message requested the other
users to validate that signal or not. Each user may then vote by making
either a similar head movement (which sends the same command signal) or
an opposite head movement. A voting rule (unanimity or majority) enables
the device 2000 to determine, ultimately, whether or not the received
command signal must be executed.

[0082] According to still another application, those data initially stored
in the memory 1300 may comprise an item of synchronization information
(for example a frequency) specific to the user. For example, it may be a
speed of obturation of each eye for active 3D glasses, that is adapted to
the eyes of the user. In this case, the synchronization information is
sent to the 3D viewing device 2000, which, on reception thereof, adapts
the display speed of the images and thus of synchronization of the
obturations according to that synchronization information.

[0083] According to another configuration, the data DATA sent are not
initially stored in the memory 1300. They are the result of processing by
the microcontroller, for example on the basis of an item of information
stored in the memory 1300. Once again, this processing generating the
data DATA or else the sending thereof to the device 2000, may depend on
the authentication of the user as described earlier.

[0084] According to an application, the glasses 1000 store a cryptographic
key at 1300 and the microcontroller 1100, in case of successful
authentication of the user, uses it to decrypt (using conventional
mechanisms) an encrypted digital content received from an external source
(for example from the viewing device 2000 using the bi-directional
communication 1200-2200). A decrypted digital content DATA is thus
obtained, which is then sent to the viewing device 2000.

[0085] The digital content may be a multimedia content such as a game, a
film, or an access to a home automation service.

[0086] In the preceding examples, the data DATA sent are directly used by
the viewing device 2000 to display a digital content: the data DATA
either directly form all or part of the digital content to display, or
data (cryptographic key) authorize the rendering of such a content, or
configuration information affecting for example the rendering or
affecting display parameters of the device 2000.

[0087] According to a variant however, the device 2000 may play the simple
role of router of the data DATA to another item of equipment, for example
the glasses of another user, a mobile telephone or a decoder (a DTT
receiver for example). In this configuration, that other item of
equipment integrates a function not present in the device 2000 and which
is necessary for the processing of the data DATA before for example
display on the device 2000. Thus, those data are routed to that item of
equipment, which processes them and may send them to the viewing device
for display.

[0088] For example, the glasses 1000 of the user comprise a data reception
interface (radio interface), for example for receiving telephone calls or
a DTT signal.

[0089] When that other item of equipment is of mobile telephone type, the
call signal information or even the telephone conversation itself are
sent from the glasses 1000 to the mobile telephone via the device 2000,
the latter reproducing the call: display on the screen of the information
of the communication in course (caller number, length, call signal, etc.)
and audio rendering of the telephone conversation.

[0090] When the other item of equipment is a DTT decoder, an encoded DTT
signal received by the glasses is sent to the DTT decoder via the device
2000 for decoding. The decoded DTT stream is sent back by the decoder to
the device 2000 for display on the screen 2400.

[0091] In a variant of the first general example of the invention, no
authentication data is acquired, but merely an item of information on
utilization of the glasses. With reference to FIG. 3, the acquisition
interface 1400 comprises a sensor configured to detect the opening and
the closing of the arms of the glasses. By way of example, it may be a
sensor of the position of the hinges between the arms and the frame rims
of the glasses, or a detector of the presence of a head in close
proximity to the glasses.

[0092] In the example in the Figure, they are simple mechanical or
capacitive buttons making it possible to know whether the glasses are in
course of use (arms open) or not (arms closed).

[0093] Depending on that information on utilization of the glasses
acquired by the sensor 1400, the glasses send a command signal DATA
either for switching on the device 2000 (in case of open glasses) or for
turning off that device or putting it on standby (in case of closed
glasses or the absence of a head in proximity to the glasses, that is to
say when the user is not wearing the glasses).

[0094] In these different examples of FIGS. 1 to 3, the viewing device
2000 is an item of equipment physically distinct from the glasses 1000 of
the invention. It may in particular be a television, a computer or a
tablet computer.

[0095] The explanations and mechanisms described above may also apply to a
configuration in which the viewing device 2000 forms an integral part of
the glasses 1000. In particular, those two entities may have at their
disposal communication interfaces 1200 and 2200 described earlier to
communicate with each other, wirelessly or possibly by wired connection.